Anthony Ervin, 35, is one of the oldest swimmers at the Games and he is in the second semi-final of the 50m free. Also racing is Australia’s Cameron McEvoy. This should be good practice for liveblogging the 100m on Sunday. And ... it’s Govorov of Russia first, Ervin second and Proud of GB third. Another disappointing race for McEvoy, he is seventh.

Kayla Harrison won her second straight judo gold earlier today and immediately retired. And like all people who are incredibly good at fighting, she is considering a career in mixed martial arts (Ronda Rousey, possibly the most famous MMA fighter in the world is also a judo medallist). Here’s what Harrison had to say:

“I’m sure they were watching today. If they weren’t, they were missing out.” She also said she was a good singer, so the future is still open. The full story is here:

USA's Kayla Harrison wins second straight Olympic judo gold

And we’re at the pool. I can report it’s watery in the extreme. Water, water everywhere and plenty to drink - as long as you’re prepared to pay ramped up prices. Our first sight of Phelps - looking intense - and Lochte, looking like a fun guy, which is What He Does. They race in the 200m medley final in, oooh, an hour.

Police arrested two people on Thursday suspected of supporting Islamic State in planning a possible attack during the Olympic Games in Rio de Janeiro.

Police had arrested 12 people before Thursday’s operation, all suspected of collaboration with Islamic State militants. Brazil’s federal police said three others have been interrogated and later released. The two arrested on Thursday were Brazilians, but police did not provide names or other details.

Although Brazil has no history of conflict with known militant groups, the government has said the Games made the country a more likely target, particularly because of participation by countries fighting Islamic State.

Its militants control parts of Iraq and Syria and a US-led coalition has conducted air strikes against them. The group has supporters worldwide who have carried out shootings and bombings of civilians.

I never thought I’d say this, but I’ve got a tear-jerking update from the world of discus. With that event not far off, Australian hope Benn Harradine has spoken to Australian TV network Seven and given an insight into his remarkable bond with his father and coach, Ken. “Dad and I are like two hearts beating in one chest,” he says. Ken gave up his teaching job to coach his son full-time, a sacrifice that he says has coast him half a million dollars.

Otherwise, all Australian eyes are on the pool, where the Campbell sisters will vie for gold (and most likely silver too, unless they achieve their dream of a dead heat) in the 100m freestyle final in just over an hour. Australia’s other medal chances are Taylor McKeown in the women’s 200m breaststroke and Mitch Larkin in the 200m backstroke.

Fiji waltz away with Olympic gold against an outclassed Great Britain

The US women’s hockey team, who finished dead last in London, have now won all four of their group matches in Rio, having defeated India 3-0. They now face Great Britain on Saturday. The London 2012 bronze medallists are currently leading Japan 1-0 and if they hold on both sides will go into the game with 100% records as they aim for top seeding for the knockout rounds. And to add a little more spice the US coach is Craig Parnham, who represented GB at the 2000 and 2004 Olympics.

Late call-up Andy Murray wins in mixed doubles with Heather Watson

Like it or not (and Rory McIlroy isn’t too fussed either way), golf is here, and Barney Ronay has been sampling the atmosphere – and the wildlife –at the Barra da Tijuca course.

Higher, faster, stronger, knitwear. Golf is officially back at the Olympics; the opening round of the men’s competition passing off in a strolling haze of putts and chips and team-branded nylon slacks on a breezy, intoxicating day on Rio’s suburban coastline.

Read on here:

Birdies beat the snakes and crocs as golf comes to Rio’s Teletubbyland

More on that controlled explosion at the basketball arena from Reuters:

Fans missed the start of the men’s Olympic basketball contest between Nigeria and Spain on Thursday after an unattended backpack was found in the arena, triggering a security alert and a controlled detonation of the bag. Television images showed the players, including Spanish NBA star Pau Gasol, starting play against the backdrop of tiers of empty seats after security held back crowds from entering the arena. The backpack was carried away by a robot and detonated, a spokesman for Rio 2016 confirmed. Detonating unattended bags has been common this Games amid concerns over security at South America’s first Olympics. A security agent said the backpack was discovered after the Brazil-Croatia game. A tablet computer, some socks and a jacket were found inside the backpack following the detonation. The public were allowed into the arena immediately afterwards, a spokesman said.

The US women’s hockey team continue to be one of the surprise packages of these Games. The US have only won two medals (both bronze) in Olympic history but they’re a perfect three for three so far in Rio and already have a place in the quarter-finals. It looks like they’ll make it four wins – they’re 1-0 up at the half against India. The US will play the other unbeaten team in the group, Britain, on Saturday.

Heather Watson might be one of the luckiest athletes in the history of the Olympics. Bundled out of the singles but hanging in to support her mates before heading home, she got the latest of call-ups to partner Andy Murray in the mixed doubles – and they are now two wins away from a gold medal. She said after performing brilliantly to help a tired Murray over the line, 6-3, 6-3, against the Spaniards David Ferrer and Carla Suárez Navarro: “I had a flight tonight. I genuinely had all my stuff packed, I brought it here, I came here just in case. I had no idea, wasn’t sure if we’d get in and then just got told, ‘Get your kit on, you’re on.”

Let’s not forget the Great Britain team who have exceeded most people’s expectations with a silver medal. A scratch side of eight Englishmen, two Scots and two Welshmen that came together barely 10 weeks ago made it all the way to the final but came up against a truly phenomenal Fijian team.

That’s Fiji’s first Olympic medal of any kind and it’s gold. The team are gathered in the centre of field, arms linked and singing.

Before the final their English coach, Ben Ryan, observed: “Spiritual is a really good way to sum up how the team operates,” he said. “The singing in the mornings, the signing in the evenings. The prayers.

“It’s like there’s two religions in Fiji, he said. On Sunday there’s church and no sport, but every other day there’s rugby.”